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2 years ago

Jimmy can walk 2/9 of a mile in 2/9 of an hour. How fast does he walk in miles/hour

Mathematics

1 answer:

kobusy [5.1K]2 years ago

7 0

Answer:

The speed of jimmy = 1 mile /hour .

Step-by-step explanation:

Distance traveled by jimmy = 2/9 miles

Time taken = 2/9

Speed = distance / time = 1 mile/ hour

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A sample of 5 strings of thread is randomly selected and the following thicknesses are measured in millimeters. Give a point est

liq [111]

Answer:

$s^2 = \frac{(1.48-1.502)^2 +(1.45-1.502)^2 +(1.54-1.502)^2 +(1.52-1.502)^2 +(1.52-1.502)^2}{5-1} =0.00132$

And for the deviation we have:

$s= \sqrt{0.00132}=0.0363$

And that value represent the best estimator for the population deviation since:

$E(s) =\sigma$

Step-by-step explanation:

For this case we have the following data:

1.48,1.45,1.54,1.52,1.52

The first step for this cae is find the sample mean with the following formula:

$\bar X =\frac{\sum_{i=1}^n X_}{n}$

And replacing we got:

$\bar X= \frac{1.48+1.45+1.54+1.52+1.52}{5} = 1.502$

And now we can calculate the sample variance with the following formula:

$s^2 =\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}$

And replacing we got:

$s^2 = \frac{(1.48-1.502)^2 +(1.45-1.502)^2 +(1.54-1.502)^2 +(1.52-1.502)^2 +(1.52-1.502)^2}{5-1} =0.00132$

And for the deviation we have:

$s= \sqrt{0.00132}=0.0363$

And that value represent the best estimator for the population deviation since:

$E(s) =\sigma$

4 0

2 years ago

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Help Me PLEASE!!! Simplify The Equation (2nd question)

scoray [572]

I think it would be 8-3, not 7. 8x - 2x + 5x = (8-5)x + 5x

5 0

2 years ago

Another one lol(picture)

Andreyy89

Look up the law of sines, I suggest Khan Academy. It is better if you know how to do it, it is very useful.

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2 years ago

What is the slope of the line that passed through (3,-4) and (4,9)

Advocard [28]

Step-by-step explanation:

<u>Step 1: Find the slope</u>

<u /> $m=\frac{y_2-y_1}{x_2-x_1}$

$m=\frac{9-(-4)}{4-3}$

$m =\frac{9+4}{1}$

$m=13$

Answer: The slope is 13

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3 years ago

Which pair of angles is a pair of corresponding?

Agata [3.3K]

Answer:

3 and 8 is a pair of corresponding.

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2 years ago

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